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Related Party Transactions (Narrative) (Details) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 QIAGEN Finance [Member] USD ($) | Dec. 31, 2011 QIAGEN Finance [Member] USD ($) | Dec. 31, 2012 QIAGEN Euro Finance [Member] USD ($) | Dec. 31, 2011 QIAGEN Euro Finance [Member] USD ($) | Dec. 31, 2011 Former Chief Executive Officer [Member] USD ($) | Dec. 31, 2011 Former Chief Executive Officer [Member] EUR (€)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of interest in a joint venture company |  |  | 100.00% |  | 100.00% |  |  |
Notes payable to related parties |  |  | $ 145,000,000 | $ 145,000,000 | $ 300,000,000 | $ 300,000,000 |  |
Accrued interest on loans payable to related parties |  |  | 4,400,000 |  | 2,600,000 | 3,000,000 |  |
Accounts receivable from related parties | 2,651,000 | 3,606,000 | 3,400,000 |  | 1,300,000 | 1,600,000 |  |
Related Party Daily Fee |  |  |  |  |  |  |  | 2,750
Fees paid to related parties |  |  |  |  |  |  | 100,000 |
Due to Affiliate, Current | 7,700,000 |  |  |  |  |  |  |
Due To Affiliate, Providing Certain Milestones Have Been Achieved | $ 2,000,000 |  |  |  |  |  |  |

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